package com.example.mallcoupon.sentinel;

import com.alibaba.csp.sentinel.adapter.spring.webmvc.callback.BlockExceptionHandler;
import com.alibaba.csp.sentinel.slots.block.BlockException;
import com.alibaba.csp.sentinel.slots.block.authority.AuthorityException;
import com.alibaba.csp.sentinel.slots.block.degrade.DegradeException;
import com.alibaba.csp.sentinel.slots.block.flow.FlowException;
import com.alibaba.csp.sentinel.slots.block.flow.param.ParamFlowException;
import org.springframework.stereotype.Component;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@Component
public class SentinelExceptionHandle implements BlockExceptionHandler {

	@Override
	public void handle(HttpServletRequest request, HttpServletResponse response, BlockException e) throws Exception {
		String msg = "未知异常";
		int status = 429;

		if (e instanceof FlowException){
			msg = "请求被限流了";
		} else if (e instanceof ParamFlowException){
			msg = "请求被热点参数限流了";
		} else if (e instanceof DegradeException){
			msg = "请求被降级了";
		} else if (e instanceof AuthorityException){
			msg = "没有权限访问";
			status = 401;
		}

		response.setContentType("application/json;charset=utf-8");
		response.setStatus(status);
		response.getWriter().println("{\"msg\":"+msg +",\"status\":" +status+"}");
	}
}
